SELinux defines process types (domains) for each process running on the system

You can see the context of a process using the -Z option to psbP

Policy governs the access confined processes have to files. SELinux openshift_app policy is very flexible allowing users to setup their openshift_app processes in as secure a method as possible.

The following process types are defined for openshift_app:

openshift_app_t

Note: semanage permissive -a openshift_app_t can be used to make the process type openshift_app_t permissive. SELinux does not deny access to permissive process types, but the AVC (SELinux denials) messages are still generated.

The SELinux process type openshift_app_t is an MCS (Multi Category Security) constrained type. Sometimes this separation is referred to as sVirt. These types are usually used for securing multi-tenant environments, such as virtualization, containers or separation of users. The tools used to launch MCS types, pick out a different MCS label for each process group.

For example one process might be launched with openshift_app_t:s0:c1,c2, and another process launched with openshift_app_t:s0:c3,c4. The SELinux kernel only allows these processes can only write to content with a matching MCS label, or a MCS Label of s0. A process running with the MCS level of s0:c1,c2 is not allowed to write to content with the MCS label of s0:c3,c4

SELinux policy is customizable based on least access required. openshift_app policy is extremely flexible and has several booleans that allow you to manipulate the policy and run openshift_app with the tightest access possible.

If you want to determine whether crond can execute jobs in the user domain as opposed to the the generic cronjob domain, you must turn on the cron_userdomain_transition boolean. Enabled by default.

setsebool -P cron_userdomain_transition 1

If you want to deny any process from ptracing or debugging any other processes, you must turn on the deny_ptrace boolean. Enabled by default.

The SELinux process type openshift_app_t can manage files labeled with the following file types. The paths listed are the default paths for these file types. Note the processes UID still need to have DAC permissions.